Microsoft has released the official ISO images for Windows 10 of version 21H2 for Insiders (build 19044.1202). The same version is currently available on the Release Preview channel. So now you can download the ISO you are interested in and do a clean install of the latest version of Windows 10.
Release Preview versions are fairly stable. Although it is a pre-release version, it has changes compared to the current "fixed" version. As with the 20H2 and 21H1 versions, the new 21H2 version will be a small cumulative update for Windows 10 of the 2004 version with a few minor changes. All pre-mentioned versions of Windows 10 share the same code base.
So, Windows 10 of the 21H2 version are based on the same code as the 2004, 20H2 and 21H1 versions. In addition, all changes from 20H2, 21H1 and 21H2 were added to the 2004 version with cumulative updates. They are simply hidden and must be activated with an "activation" package. So it is very likely that the upgrade to version 21H2 at this time will not affect the user experience.
To download the ISO you are interested in, sign in with your Microsoft Account and Insider Program from here.
Select build "19044.1202" from the list of available versions.
Select the desired language, e.g. Greek and confirm your choice.
You can then download the ISO file in 32 or 64-bit.